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I don't think there is unless its a private charter. There used to be an operator who did a sunset cruise ex Rodney Bay down to Marigot Bay with a tie up to eat at Rain Forest Hideaway an excellent restaurant. Not sure if it still runs. I suggest you look at Rain Forest Hideaways web site and/or email them

Otherwise, you are looking at a private charter. It also depends where on the island they are staying - if it is in the Soufriere area, the Bateau cruise wouldn't make a lot of sense for them as it is a 45 -1 hour drive to get to the boat.